Detection device for low-haze PET window film of automobile

Abstract

The invention relates to the technical field of automobile parts, in particular to an automobile low-haze PET window film detection device which comprises a base. The spectrograph is arranged on the base; the film fixing mechanism is arranged in the base and used for fixing a PET window film; the mobile detection mechanism is mounted on the base, and a detection space is formed by the mobile detection mechanism and the film fixing mechanism; and the optical detection mechanism is connected with the mobile detection mechanism and is driven by the mobile detection mechanism to move in a detection space so as to perform optical detection on the PET window film fixed on the film fixing mechanism. Local air pressure is dynamically adjusted through the air pressure adjusting valve according to data of the distributed optical fiber sensor so as to compensate film surface deformation, active vibration elimination and environmental vibration interference suppression are combined with the piezoelectric ceramic piece, static electricity is synchronously eliminated through the conductive silica gel protruding points in the detection process, and data stability is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a testing device for low-haze PET window film for automobiles. Background Technology

[0002] Automotive window film is a high-performance window film made of polyethylene terephthalate (PET) as the base material. It has an extremely low haze value, which can significantly reduce the scattering of light when it passes through, making the field of vision clearer and more transparent, improving driving safety. At the same time, it has high light transmittance, which can reduce glare interference while ensuring the lighting inside the car. It can be adapted to the curved shape of automotive glass through thermoforming process and is widely used in automotive windshields, side windows and other parts. While optimizing optical performance, it also takes into account energy saving, environmental protection and driving comfort. In order to ensure the quality of window film leaving the factory, it is usually necessary to conduct random inspection of products. Therefore, a testing device for automotive low haze PET window film is required.

[0003] Existing testing devices for low-haze PET window films for automobiles have some shortcomings in use: the window film is difficult to fix during testing, which can easily cause physical damage to the surface of the low-haze film and generate static electricity. Furthermore, wrinkles on the surface of the window film are difficult to handle, affecting the perpendicular incidence of subsequent light paths and thus affecting the testing results.

[0004] To address these issues, those skilled in the art have proposed a detection device for automotive low-haze PET window film. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to avoid physical damage to the surface of the window film during the testing process and to ensure the flatness of the window film during the testing process.

[0006] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a detection device for low-haze PET window film for automobiles, which includes a base;

[0007] A spectrometer mounted on the base;

[0008] A film fixing mechanism, located inside the base, is used to fix the PET window film;

[0009] A mobile testing mechanism is installed on the base, forming a testing space with the film fixing mechanism;

[0010] An optical inspection mechanism is connected to the mobile inspection mechanism and is driven by the mobile inspection mechanism to move within the inspection space to perform optical inspection on the PET window film fixed on the film fixing mechanism.

[0011] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, the film fixing mechanism includes:

[0012] The air suction plate has inclined micro-holes on its surface for adsorbing PET window film. The inclined micro-holes are inclined upward towards the center of the air suction plate. A frame-shaped slot is opened on the outer side of the air suction plate near the inclined micro-holes. A frame-shaped seat is provided inside the frame-shaped slot. Protective pads are provided at the bottom of the frame-shaped seat and inside the frame-shaped slot.

[0013] A rigid base is installed on the inner wall of the base. The air suction plate is fixed above the rigid base. An airflow duct communicating with the inclined micropore is provided inside the rigid base. Multiple air pumps are provided inside the base. The airflow duct drives the airflow through the corresponding air pump.

[0014] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, a piezoelectric ceramic sheet is provided between the air suction plate and the rigid base, and flexible silicone pads are installed on both the upper and lower sides of the piezoelectric ceramic sheet to suppress vibration during the detection process.

[0015] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, wherein: a distributed optical fiber sensor is embedded in the surface of the air suction plate, the distributed optical fiber sensor is used to monitor the surface flatness of the PET window film, and an air pressure regulating valve is provided at the output end of the air pump, the air pressure regulating valve dynamically adjusts the local air pressure according to the data of the distributed optical fiber sensor to compensate for the deformation of the film surface.

[0016] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, the mobile detection mechanism includes two support frames, which are horizontally installed on the front and rear outer walls of the base. A transverse electric slide rail is horizontally installed on the support frame, and a slider is slidably arranged on the transverse electric slide rail. A connecting frame is fixedly installed on the surface of each of the two sliders, and a connecting plate is installed at one end of each of the two connecting frames.

[0017] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, a longitudinal electric slide rail is horizontally installed on the bottom outer wall of the connecting plate, a second slider is slidably arranged on the longitudinal electric slide rail, an electric cylinder is arranged at the bottom of the second slider, and the optical detection mechanism is connected to one end of the extension rod of the electric cylinder.

[0018] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, the optical detection mechanism includes a mounting base, which is fixed to the bottom of an electric cylinder. A laser emitter, a photodetector, and a high-frequency pulse generator are mounted on the surface of the mounting base. One end of the laser emitter, the photodetector, and the high-frequency pulse generator is equipped with the same flexible silicone detection head.

[0019] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, the flexible silicone detection head is provided with thirty-two sets of optical fiber bundles, including a transmitter and a receiver. The bottom of the flexible silicone detection head is provided with four mounting plates. One end of the optical fiber bundle passes through the surface of the corresponding mounting plate. The surface of the flexible silicone detection head is covered with a nano-level reflective coating, which adaptively conforms to the curved surface when in contact with the sample. The laser emitter and the photodetector are respectively connected to the spectrometer through the optical fiber bundles.

[0020] As a preferred embodiment of the detection device for low-haze PET window film of the present invention, the bottom outer wall of the flexible silicone detection head is provided with a plurality of conductive silicone bumps, which are electrically connected to the high-frequency pulse generator to eliminate static electricity on the surface of the PET window film.

[0021] The beneficial effects of the detection device for low-haze PET window film of the present invention are as follows: the film is fixed by adsorbing it with the air suction principle of the air suction plate to avoid physical damage, while dynamically compensating for wrinkles on the film surface. The surface flatness of the PET window film is monitored by a distributed optical fiber sensor. The local air pressure is dynamically adjusted by the air pressure regulating valve according to the data of the distributed optical fiber sensor to compensate for the deformation of the film surface. Combined with the active vibration damping of the piezoelectric ceramic sheet, the environmental vibration interference is suppressed. During the detection process, static electricity is eliminated simultaneously by conductive silicone bumps, which improves the stability of the data. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of a testing device for low-haze PET window film for automobiles.

[0024] Figure 2 This is a schematic diagram of the film fixing mechanism of a testing device for low-haze PET window film for automobiles.

[0025] Figure 3 This is an unfolded diagram of the base and film fixing mechanism of the testing device for low-haze PET window film for automobiles.

[0026] Figure 4 This is a schematic diagram of the moving detection mechanism of a testing device for low-haze PET window film for automobiles.

[0027] Figure 5 This is a schematic diagram of the optical inspection mechanism of a testing device for low-haze PET window film for automobiles.

[0028] In the diagram: 100, base; 200, moving detection mechanism; 201, support frame; 202, transverse electric slide rail; 203, slider one; 204, connecting frame; 205, connecting plate; 206, longitudinal electric slide rail; 207, slider two; 208, electric cylinder; 300, film fixing mechanism; 301, air suction plate; 302, frame-type card holder; 303, inclined micro-hole; 304, distributed fiber optic sensor; 305, air pump; 306, frame-type card slot; 307, piezoelectric ceramic sheet; 308, rigid base; 309, airflow duct; 400, optical detection mechanism; 401, mounting base; 402, laser emitter; 403, photodetector; 404, high-frequency pulser; 405, flexible silicone detection head; 406, conductive silicone bump; 407, mounting plate; 408, fiber optic bundle; 500, spectrometer. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0030] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0031] Example 1

[0032] Reference Figures 1 to 4 This is the first embodiment of the present invention, which provides a detection device for automotive low-haze PET window film, including a base 100;

[0033] Spectrometer 500 is mounted on base 100;

[0034] The film fixing mechanism 300 is disposed inside the base 100 and is used to fix the PET window film;

[0035] The mobile testing mechanism 200 is mounted on the base 100 and forms a testing space with the film fixing mechanism 300;

[0036] The optical inspection mechanism 400 is connected to the mobile inspection mechanism 200 and is driven by the mobile inspection mechanism 200 to move within the inspection space to perform optical inspection on the PET window film fixed on the film fixing mechanism 300.

[0037] Specifically, the film fixing mechanism 300 includes:

[0038] The air suction plate 301 has inclined micro-holes 303 on its surface for adsorbing PET window film. The inclined micro-holes 303 are inclined upward towards the center of the air suction plate 301. A frame-shaped slot 306 is opened on the outer side of the air suction plate 301 near the inclined micro-holes 303. A frame-shaped seat 302 is provided inside the frame-shaped slot 306. Protective pads are provided at the bottom of the frame-shaped seat 302 and inside the frame-shaped slot 306.

[0039] A rigid base 308 is installed on the inner wall of the base 100. An air suction plate 301 is fixed above the rigid base 308. An airflow duct 309 communicating with the inclined micro-hole 303 is provided inside the rigid base 308. Multiple air pumps 305 are provided inside the base 100. The airflow duct 309 drives the airflow through the corresponding air pump 305.

[0040] Furthermore, a piezoelectric ceramic sheet 307 is provided between the air suction plate 301 and the rigid base 308. Flexible silicone pads are installed on both the upper and lower sides of the piezoelectric ceramic sheet 307 to suppress vibration during the detection process.

[0041] Among them, a distributed optical fiber sensor 304 is embedded in the surface of the air suction plate 301. The distributed optical fiber sensor 304 is used to monitor the surface flatness of the PET window film. An air pressure regulating valve is provided at the output end of the air pump 305. The air pressure regulating valve dynamically adjusts the local air pressure according to the data of the distributed optical fiber sensor 304 to compensate for the deformation of the film surface.

[0042] Preferably, the mobile detection mechanism 200 includes two support frames 201, which are horizontally mounted on the front and rear outer walls of the base 100. A transverse electric slide rail 202 is horizontally mounted on the support frame 201, and a slider 203 is slidably mounted on the transverse electric slide rail 202. A connecting frame 204 is fixedly mounted on the surface of each slider 203, and a connecting plate 205 is mounted on one end of each connecting frame 204.

[0043] It should be noted that a longitudinal electric slide rail 206 is horizontally installed on the bottom outer wall of the connecting plate 205, and a slider 207 is slidably arranged on the longitudinal electric slide rail 206. An electric cylinder 208 is arranged at the bottom of the slider 207, and the optical inspection mechanism 400 is connected to one end of the extension rod of the electric cylinder 208.

[0044] In use, first open the frame-type card holder 302, then place the sampled film on the surface of the air suction plate 301. The periphery of the film extends into the frame-type card slot 306 and is secured by the frame-type card holder 302. Then, start the air pump 305, and the film is adsorbed and fixed by the air suction plate 301. The film is adsorbed by the inclined micro-holes 303, which form a centripetal adsorption force to adsorb and fix it. The surface flatness of the PET window film is monitored by the distributed optical fiber sensor 304. The local air pressure is dynamically adjusted by the air pressure regulating valve according to the data of the distributed optical fiber sensor 304 to compensate for the deformation of the film surface. Combined with the piezoelectric ceramic sheet 307, the vibration is actively damped to suppress environmental vibration interference. Then, start the horizontal electric slide rail 202 and the vertical electric slide rail 206. The optical inspection mechanism 400 is moved by the slider one 203 and the slider two 207. The optical inspection mechanism 400 is moved down by the electric cylinder 208 to contact the film and then inspect the film.

[0045] Example 2

[0046] Reference Figure 1 and Figure 5 This is the second embodiment of the present invention. Unlike the previous embodiment, the optical detection mechanism 400 includes a mounting base 401, which is fixed to the bottom of the electric cylinder 208. A laser emitter 402, a photodetector 403, and a high-frequency pulser 404 are mounted on the surface of the mounting base 401. A flexible silicone detection head 405 is mounted on one end of the laser emitter 402, the photodetector 403, and the high-frequency pulser 404.

[0047] Specifically, the flexible silicone detection head 405 has thirty-two sets of fiber bundles 408 inside, including a transmitter and a receiver. The bottom of the flexible silicone detection head 405 has four mounting plates 407. One end of the fiber bundle 408 passes through the surface of the corresponding mounting plate 407. The surface of the flexible silicone detection head 405 is covered with a nano-level reflective coating, which adaptively conforms to the curved surface when in contact with the sample. The laser emitter 402 and the photodetector 403 are respectively connected to the spectrometer 500 through the fiber bundles 408.

[0048] Furthermore, the bottom outer wall of the flexible silicone detection head 405 is provided with multiple conductive silicone bumps 406, which are electrically connected to the high-frequency pulse generator 404 to eliminate static electricity on the surface of the PET window film.

[0049] In use, the PET window film is fixed non-contactly and its flatness is adjusted by the film fixing mechanism 300. The moving detection mechanism 200 drives the optical detection mechanism 400 to perform a full-area scan of the film surface. At the same time, the piezoelectric ceramic sheet 307 suppresses environmental vibrations and the conductive silicone bumps 406 eliminate electrostatic interference. The optical signal is transmitted to the spectrometer 500 via the fiber bundle 408 to calculate and analyze the haze value, transmittance, and defect distribution. The laser emitter 402 outputs 550nm monochromatic parallel light through the emitting end of the fiber bundle 408, which is perpendicularly incident on the PET window film. After the beam passes through the film material, the scattered light is collected by the photodetector 403 through the receiving end of the fiber bundle and used to calculate the haze value. The transmittance is directly calculated by the ratio of transmitted light intensity to incident light intensity. Based on the machine learning model, the haze value is associated with defect characteristics (such as the scattering light patterns of scratches and bubbles), the defect type is automatically identified, and an inspection report is generated, which includes data such as full-area haze distribution, transmittance uniformity, defect location, and electrostatic voltage curve.

[0050] By utilizing the elastic deformation capability of silicone, the end face of the fiber bundle can be tightly attached to the uneven surface of the PET film (such as curved surfaces and wrinkles), avoiding detection errors caused by poor contact in traditional rigid probes, improving the optical coupling efficiency between the fiber end face and the sample, reducing light scattering caused by air gaps, and enhancing the intensity of reflected signals. It is especially suitable for detecting weak light signals in low-haze (high-transmittance) PET films.

[0051] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A detection device for low-haze PET window film for automobiles, characterized in that: include, Base (100); A spectrometer (500) is mounted on the base (100); A film fixing mechanism (300) is disposed inside the base (100) for fixing the PET window film; A mobile detection mechanism (200) is installed on the base (100) and forms a detection space with the film fixing mechanism (300); An optical inspection mechanism (400) is connected to the mobile inspection mechanism (200) and is driven by the mobile inspection mechanism (200) to move within the inspection space to perform optical inspection on the PET window film fixed on the film fixing mechanism (300).

2. The detection device for low-haze PET window film for automobiles as described in claim 1, characterized in that: The film fixing mechanism (300) includes: An air suction plate (301) has inclined micro-holes (303) on its surface for adsorbing PET window film. The inclined micro-holes (303) are inclined upward toward the center of the air suction plate (301). A frame-shaped slot (306) is opened on the surface of the air suction plate (301) near the outer side of the inclined micro-holes (303). A frame-shaped seat (302) is provided inside the frame-shaped slot (306). Protective pads are provided at the bottom of the frame-shaped seat (302) and inside the frame-shaped slot (306). A rigid base (308) is installed on the inner wall of the base (100). The air suction plate (301) is fixed above the rigid base (308). An airflow duct (309) communicating with the inclined micro-hole (303) is provided inside the rigid base (308). A plurality of air pumps (305) are provided inside the base (100).

3. The detection device for low-haze PET window film for automobiles as described in claim 2, characterized in that: A piezoelectric ceramic sheet (307) is provided between the air suction plate (301) and the rigid base (308), and flexible silicone pads are installed on both the upper and lower sides of the piezoelectric ceramic sheet (307).

4. The detection device for low-haze PET window film for automobiles as described in claim 3, characterized in that: The surface of the air suction plate (301) is embedded with a distributed optical fiber sensor (304), which is used to monitor the surface flatness of the PET window film. The output end of the air pump (305) is equipped with an air pressure regulating valve.

5. The detection device for low-haze PET window film for automobiles as described in claim 4, characterized in that: The mobile detection mechanism (200) includes two support frames (201), which are horizontally installed on the front and rear outer walls of the base (100). A transverse electric slide rail (202) is horizontally installed on the support frame (201), and a slider (203) is slidably arranged on the transverse electric slide rail (202). A connecting frame (204) is fixedly installed on the surface of each of the two sliders (203), and a connecting plate (205) is installed at one end of each of the two connecting frames (204).

6. The detection device for low-haze PET window film for automobiles as described in claim 5, characterized in that: A longitudinal electric slide rail (206) is horizontally installed on the bottom outer wall of the connecting plate (205). A second slider (207) is slidably arranged on the longitudinal electric slide rail (206). An electric cylinder (208) is arranged at the bottom of the second slider (207). The optical detection mechanism (400) is connected to one end of the extension rod of the electric cylinder (208).

7. The detection device for low-haze PET window film for automobiles as described in claim 6, characterized in that: The optical inspection mechanism (400) includes a mounting base (401) fixed to the bottom of an electric cylinder (208). A laser emitter (402), a photodetector (403), and a high-frequency pulser (404) are mounted on the surface of the mounting base (401). One end of the laser emitter (402), the photodetector (403), and the high-frequency pulser (404) is equipped with the same flexible silicone inspection head (405).

8. The detection device for low-haze PET window film for automobiles as described in claim 7, characterized in that: The flexible silicone detection head (405) is internally provided with thirty-two sets of optical fiber bundles (408), including a transmitting end and a receiving end. The bottom of the flexible silicone detection head (405) is provided with four mounting plates (407). One end of the optical fiber bundle (408) passes through the surface of the corresponding mounting plate (407). The surface of the flexible silicone detection head (405) is covered with a nano-level reflective coating, which adaptively conforms to the curved surface when in contact with the sample. The laser emitter (402) and the photodetector (403) are respectively connected to the spectrometer (500) through the optical fiber bundles (408).

9. The detection device for low-haze PET window film for automobiles as described in claim 8, characterized in that: The flexible silicone detection head (405) has multiple conductive silicone bumps (406) on its bottom outer wall, and the conductive silicone bumps (406) are electrically connected to the high-frequency pulse generator (404).

Images